Ultrasonic method for the production of inorganic/organic hybrid nanocomposite
a nanocomposite and hybrid technology, applied in the field of ultrasonic methods for the production of organic/organic hybrid nanocomposites, can solve the problems of re-agglomeration or inhomogeneous nanocomposites, and achieve the effects of preventing re-agglomeration of nanoparticles, and reducing the cost of production
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example 1
[0099] The first example, RX 05505, shows preparation of nanocomposite via the combination of ultrasonic irradiation and surface modification / functionalization of nanoparticles. KenRich Petrochemicals Inc provides neoalky zirconate (titanate and etc.), chelated titanate (or zirconate and etc.), monoalkoxy titanate (or zirconate and etc.) as some examples of coupling agents. Typically, NZ 39, named neopentyl (diallyl) oxy triacryl zirconate was employed in this example. By using this coupling agent, nanoparticle surface modification provides, in addition to better compatibility between inorganic and organic matrix, polymerizable / crosslink-able reactivity, preferably, UV curable functionality. The molecular structure of this coupling agent is represented as follows.
[0100] The composition of this nanocomposite is shown in Column 1 in Table 2
TABLE 2EXAMPLE 1EXAMPLE 2EXAMPLE 3Nano-Nano-Nano-Compositioncomposite(I)Partscomposite(II)Partscomposite(III)PartsParticlesAl2O310.0Al2O34.32Si...
example 2
[0111] Following the procedures described in Example 1, with one change, produced another nanocomposite, RX 01399. The composition of this nanocomposite is listed in Column 2 of Table 2. Instead of solely using Al2O3 nanoparticles as in Example 1, the combination of Al2O3 and SiO2 nanoparticles were employed.
[0112] Again, the produced nanocomposite material was stable for at least 10 months without seeing precipitation or significant viscosity changes.
[0113] Approximately 0.5-6 mil films / coatings) were drawn down on Parker Bonderite 40 steel panels. The thickness of coatings / films depend on the # of the drawing bar and the viscosity of the materials. The panels then were cured in air using one or two 300 watt / inch mercury vapor electrodeless lamps, at the maximum belt speed that gave tack-free (cured) films / coatings.
[0114] The properties of these films / coatings were then tested according to the methods described above.
[0115] The property data listed in Table 3 clearly indicate t...
example 3
[0119] Following the preparation procedures described in Example 1 and 2 another nanocomposite was prepared. The composition is listed in Column 3 of Table 2.
[0120] Eb 1290 was used as the base resin in this example. Eb 1290 is UCB Chemicals' six-functional aliphatic urethane acrylate oligomer, which provides greater than 9H surface hardness and very good surface scratch resistance. However, it is extremely brittle. The purpose of making this nanocomposite is to increase the flexibility without loss of other advantages of Eb 1290, such as hardness and scratch resistance.
[0121] A small amount of silane, Z-6030, was added for adhesion promotion. At the same time, a very small amount of acrylic acid was added as the catalyst for hydrolysis and condensation reactions, and an equivalent amount of water was added for hydrolysis reaction of the silane.
[0122] The performance data of the nanocomposite in Table 4 indicate improvements in flexibility reflected as impact resistance and conic...
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